Are you developing your own film?
Lines on the negatives .. if they run the long way on the roll of film normally come from improper squeegee use or poor quality film canisters. As the film gets pulled into or out of the canister, it can cause lines on the file. Likewise with squeegeeing the film after you develop it before hanging it to dry.
Also, if you are bulk loading your own canisters.. that too could cause a problem with streaks and lines if done improperly.
If you are doing it yourself, improve your technique.
...yeah, I absolutely screwed up developing this roll (my first time, to be fair). I'm not bulk loading, but the lines run vertically (short ways) on the film. And always in the same place on each frame.
I sent the camera out today to get examined. We'll see what they say.

. It would be nice if it was a simple fix like that.
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